Merge pull request #10 from JuliaGraphs/add_indexing

index :name attribute, closes #9

Author: nickeubank

src/GraphDataFrameBridge.jl

@@ -27,7 +27,8 @@ function MetaGraph(
     `destination` is column symbol for destination of each edge
 
     Will create a MetaGraph with a `name` property that stores node labels
-    used in `origin` and `destination`.
+    used in `origin` and `destination`. `name` is also set as an index property
+    using `set_indexing_prop!`.
 
     Note if `df` contains duplicated edge entries, the last record will
     overwrite previous entries.
@@ -112,7 +113,6 @@ function metagraph_from_dataframe(graph_type,
         set_prop!(mg, r[:vertex_id], :name, r[:name])
     end
 
-
     # Set edge attributes
     if typeof(edge_attributes) == Symbol
         edge_attributes = Vector{Symbol}([edge_attributes])
@@ -134,6 +134,9 @@ function metagraph_from_dataframe(graph_type,
         end
     end
 
+    # Set name as index (Issue #9)
+    set_indexing_prop!(mg, :name)
+
     return mg
 end
 

test/graphdataframebridge.jl

@@ -50,5 +50,8 @@
     @test get_prop(mg, Edge(4, 5), :weight) == 4
     @test get_prop(mg, Edge(4, 5), :extraz) == 8
 
-
+    # Test name column is indexed (Issue #9)
+    @test mg["a", :name] == 1
+    @test mg["b", :name] == 2
+    
 end